@misc{Breyer_Albert_(1889–1939)_Karte_1938, author={Breyer, Albert (1889–1939)}, editor={Bibliographisches Institut (Lipsk)}, copyright={Public Domain}, address={Leipzig [Lipsk]}, howpublished={online}, year={1938}, publisher={Bibliographisches Institut AG.}, language={ger}, language={pol}, title={Karte der Deutschen Siedlungen in Mittelpolen : Maßstab 1:500 000}, keywords={population maps, nationalities, Germans, Poland}, }